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Use this request to set the default settings for sending SMS messages and receiving
daily SMS usage reports.

You can override some of these settings for a single message when you use the Publish
action with the MessageAttributes.entry.N parameter. For more information,
see Sending
an SMS Message in the Amazon SNS Developer Guide.

Note:

For .NET Core, PCL and Unity this operation is only available in asynchronous form. Please refer to SetSMSAttributesAsync.